How did the symbol of the pearl add to the reader's experience as well as the plot?

The pearl is a talisman: an object that comes to be interchangeable with a person or an idea. At one point Kino views the pearl as his soul and vows to keep it. For Kino, the success of the Pearl's sale will indicate his success. The pearl stands opposite to the canoe that at once stands for his family and is a sure bulwark against starvation. When he makes it known that he will pursue wealth by venturing on his own to the great city, his canoe is sabotaged. This is a crime greater than homicide for it is a direct assault on Kino's family—worse than burning down the house.